Abstract
A system was developed to deliver simulated rain to field grown plants and used to study the impact of acidic rain on a potato crop. In 1983 and 1984, Norchip potato plants were grown under standard field practices. Plots, 2.2 m 2 in area, received 0.5 cm of simulated rain three times per week throughout the growing season. Rain treatments had a pH of 2.8, 3.8, 4.6 or 5.6. There was also a ‘no rain’ treatment for which plants received an equivalent volume of water at the soil surface. Each treatment was replicated eight times. Two 9 × 26.4 m greenhouses mounted on rails covered the plots when simulated rain was being delivered and during ambient rain events. A drip irrigation system provided supplemental water to ensure adequate soil moisture. At harvest, tuber yield and quality were determined. There were no detectable effects of acidity on tuber weight, number, total solids, total glycoalkaloid or sugar content.
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